埋地管道阴极保护电位准则及电位测试方法  

Potential Criteria for Cathodic Protection of Buried Pipelines and Methods for Potential Measurement

作　　者：毕方晓 李伟华[1,2] 傅寿荣[1] 郑海兵[1] 徐志鹏[1] 

机构地区：[1]青岛理工大学土木工程学院,山东青岛266033 [2]中国科学院海洋研究所,山东青岛266071

出　　处：《材料保护》2014年第4期72-75,8,共4页Materials Protection

基　　金：国家自然科学基金(51179182);山东省杰出青年基金(JQ201217);青岛市产学研合作引导计划项目(12-1-4-8-(1)-jch)资助

摘　　要：目前,埋地管道阴极保护常用-850 mV和-100 mV两大电位准则,如果阴极保护电位设置不当、测试不准会影响保护效果。结合理论与实践比较了两大电位准则的适用性;总结了常用的阴极保护电位测量方法及其适用的场合。结果表明:自腐蚀电位较正(-400 mV)时,2种准则都能有效降低保护对象的腐蚀;自腐蚀电位较负(-800 mV)时,-100 mV极化值下的保护效果更优;对城市在旧管网追加阴极保护时,可采用地表参比法监测管道防腐蚀层状况,采用断电法及-100 mV准则判断阴极保护效果。In terms of the cathodic protection of buried pipelines,two potential criteria,i.e.,-850 mV criterion and- 100 mV criterion,are currently used.Naturally,the protective efficiency depends on a proper selection of cathodic protection potential and its accurate measurement as well.Viewing these perspectives,we compared the applicability of the two potential criteria in relation to theory and practice and summarized commonly used methods for measurement of cathodic protection potential as well as their applicable occasions.Results indicated that when the corrosion potential was relatively positive(-400 mV),the two potential criteria could be well adopted to effectively reduce the corrosion of the target under cathodic protection;and when the corrosion potential was relatively negative(— 800 mV),better protective efficiency was reached under- 100 mV polarization value.In terms of the additional cathodic protection of old pipeline networks in cities,ground surface reference method could be adopted to monitor the state of the anticorrosion coatings on pipelines,and the cathodic protective efficiency could be judged with power supply- interrupting method and- 100 mV potential criterion.

关 键 词：埋地管道 外加电流阴极保护 电位准则 电位测试 

分 类 号：TG174.41[金属学及工艺—金属表面处理]